package com.example.java_chatroom.api;

import com.example.java_chatroom.model.User;
import com.example.java_chatroom.model.UserMapper;
import jakarta.annotation.Resource;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpSession;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserAPI {
    @Resource
    UserMapper userMapper;//方便后续操作数据库

    @PostMapping("/login")
    @ResponseBody
    public Object login(String username, String password, HttpServletRequest req) {
        //1.先去数据库中查看，看username能否找到对应的user对象
        // 如果能找到则看一下密码是否匹配
        User user = userMapper.selectByName(username);
        if(user == null || !user.getPassword().equals(password)) {
            //随便一个都登录失败，同时返回一个空的对象即可
            System.out.println("登录失败！用户名或者密码错误！" + user);//需要重写toString方法，不然打印的就是哈希code
            return new User();
        }

        //2.如果都匹配，登录成功！创建会话！！
        HttpSession session = req.getSession(true);
        session.setAttribute("user", user);
        //在返回之前，把password给干掉，避免返回不必要的信息
        user.setPassword("");
        return user;

    }

    @PostMapping("/register")
    @ResponseBody
    public Object register(String username,String password) {
        User user = null;
        try {
            user = new User();
            user.setUsername(username);
            user.setPassword(password);
            int ret = userMapper.insert(user);
            System.out.println("注册 ret："+ ret);
            user.setPassword("");
        } catch (DuplicateKeyException e) {
            //如果insert方法抛出上述异常，说明名字重复了，注册失败（返回空对象）
            user = new User();
            System.out.println("注册失败！username = " + username);
        }
        return user;
    }

    @GetMapping("/userInfo")
    @ResponseBody
    public Object getUserInfo(HttpServletRequest req) {
        //1.先从请求中获取到会话
        HttpSession session = req.getSession(false);
        if(session == null) {
            //会话不存在，即用户尚未登录，此时返回一个空的对象即可
            System.out.println("[getUserInfo] 当前获取不到session对象");
            return new User();
        }
        //2.从会话中获取到之前保存的用户对象
        User user = (User) session.getAttribute("user");
        if(user == null) {
            System.out.println("[getUserInfo] 当前获取不到user对象");
            return new User();
        }
        user.setPassword("");
        return user;
    }
}
